JPS60112221A - Thermostat containing circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides a structure of a circuit breaker operated by electromagnetic force,
More specifically, the present invention relates to a circuit breaker that shuts off the circuit even when the temperature rises above a certain value.

Circuit breakers that operate using electromagnetic force are: 1. This method uses electromagnetic force generated by overcurrent to interrupt the circuit.

Therefore, the circuit can only be cut off when an overcurrent flows.In order to cut off the circuit even when the ambient temperature exceeds a certain standard value, a separate thermostat must be installed near the circuit breaker. I needed to. However, when implementing them in a narrow space, installation is accompanied by difficulties.

An object of the present invention is to provide a circuit breaker with a built-in thermostat that can solve the conventional problem of difficulty in mounting due to the space available for mounting the circuit breaker by providing a thermostat inside the circuit breaker.

In order to achieve the above object, the circuit breaker with a built-in thermostat according to the present invention is a circuit breaker operated by electromagnetic force, in which a thermostat (eilN91J) is connected to a series circuit of a coil and a contact point, and the circuit breaker has a built-in thermostat that is not only overcurrent but also has ambient temperature. The circuit is configured to be cut off even if the value is exceeded.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an internal structural diagram of a circuit breaker with a built-in thermostat showing an embodiment of the present invention, and is a diagram showing a switch lever in an on state U. In the figure,
1 is a switch lever, 2 is a mounting plate, 3 is a case, 4 is a cam, 5 is a cam stopper, 6 is an armature tip, 7 is a cam guide, 8 is a movable contact, 9 is a fixed contact, 10 is a contact terminal, 11 is a Movable lever, 12 is an opening spring, 13 is a switch spring, 14 is a yoke, 15 is an armature, 16 is a core lid, 17 is a core spring, 18 is a coil, 19 is a brake oil, 20 is a movable core, 21 is a core pipe, 22 is a coil terminal, 23 is a thermostat, 24-2
6 indicates each wiring.

FIG. 2 is a circuit configuration diagram showing the 'nausea circuit' portion of the circuit breaker of FIG. 1. Thermostat 23 is inserted between movable contact 8 and coil 18.

In the state shown in FIG. 1, a current flows between the contact terminal 10, the fixed contact 9, the movable contact 8, the wiring 24, the thermostat 23, the wiring 25, the coil 18, the wiring 26, and the coil logic element 22. If the current is below the rated current and the ambient temperature is below a certain reference value, the movable core 20 will move to the core spring 1.
Since it is pushed downward by 7, the electromagnetic force is not large,
Therefore, since the armature 5 is not attracted to the core cover 16, the fixed contact 9 and the movable contact 8 maintain their contact state. The thermostat contacts still remain closed and current continues to flow.

In this state, from the contact terminal 10, the fixed contact 9 → the movable contact 8 →
Wiring 24 → Thermostat 23 → Wiring 25 → Coil 18
→ Wiring 26 → When the current flowing in the path of coil terminal 22 exceeds the rated current and the pre-overload current continues to flow, the electromagnetic force increases and the movable core 20 moves against the urging force of the core spring 17 and closes the core lid. Move in direction 16 (arrow A).

When the movable core 20 reaches the core cover 16, the electromagnetic force increases rapidly, and the armature 15 is attracted to the core cover 16 and rotates in the clockwise direction B about the shaft 15a. As a result, the armature tip 6 pushes the cam stopper 5 in the direction of arrow C around the shaft 5a.

Here, the cam stopper 5 is biased in the direction opposite to the arrow C by a spring (not shown). Further, one end of the cam guide 7 is rotatably attached to the cam 4 through a shaft 7a, and the other end is rotatably attached to a movable lever 1 through a shaft 7b. The movable lever 11 is rotatably attached to the shaft 11a, and is given a clockwise rotational force by the opening spring 12. However, when the current does not exceed the rated current, the lever 11 is rotatably attached to the shaft 11a. Since the movable lever 11 is rotated to the illustrated position, the movable contact 8 and the fixed contact 9 are in contact with each other.

On the other hand, one end of the cam 4 is configured to mesh with the shaft 5a at the lower part of the shaft 5a of the cam stopper 5, and the other end is rotatably connected to the other end of the switch lever 1 (the connecting portion 4
a). The switch lever l is rotatable around the axis 1a,
The biasing force of the switch spring 13 constantly applies rotational force in the clockwise direction. When the switch lever 1 is turned on against the biasing force of the switch spring 13, the connecting portion with the cam 4 rotates counterclockwise, so that the cam 4
The engaging portion rotates clockwise and engages with the engaging portion of the cam stopper 5. At the same time, cam 4 is connected to cam guide 7.
The movable lever 11 is rotated clockwise to the illustrated position, and the movable contact and the fixed contact contact each other as described above, closing the circuit.

Now, in this state, when the cam stopper 5 is pushed in the C direction by the end macha tip 6 as described above, the movable lever 11 rotates clockwise due to the restoring force of the opening spring 12, and the movable contact 8 is fixed. As the cam is separated from the contact point 9, the engaging portion of the cam is also released from the engaging portion below the shaft 5a of the cam stopper 5, so that the restoring force of the switch spring 13 moves the switch lever 1 to the OFF position. This breaks the circuit.

However, when a short circuit current or a large load current flows, the armature 5 is attracted by the large electromagnetic force of the coil 18 alone, and the circuit is instantaneously interrupted without waiting for the movement of the movable iron core 20.

Also, even if the current flowing in the path from contact terminal 10 to fixed contact 9- + movable contact 8 → wiring 24 → thermostat 23 → wiring 25 → coil 8 → wiring 26 → coil terminal 22 is below the rated current, the surrounding When the temperature exceeds a certain reference value, the thermostat 23 operates to cut off the circuit.

Conventional circuit breakers that operate using electromagnetic force have a built-in thermostat 23, so they can only break the circuit when an overload current flows.

In this embodiment, a thermostat 23 is connected in series between the movable contact 8 and the coil 18 and built into the circuit breaker body, so that it can be used not only when an overload current flows but also when the ambient temperature is set to a certain reference value. The circuit can be cut off even if the temperature exceeds the limit, making it possible to use a circuit breaker in ways that were not possible with conventional circuit breakers, i.e., a single circuit breaker can function as both a circuit breaker and a thermostat. do.

As explained above, the present invention employs a configuration in which a thermostat is connected in series to a series circuit of a movable contact and a coil, and the thermostat is built into the circuit breaker body. ,
Even if the ambient temperature exceeds a certain reference value, the circuit can be cut off.

[Brief explanation of the drawing]

FIG. 1 shows a thermostat partially showing an embodiment of the present invention.
FIG. 2 is a diagram of the internal structure of the circuit breaker with built-in circuit breaker, and is a circuit configuration diagram of the electric circuit portion of the circuit breaker shown in FIG. 1...Switcher) (-2...Mounting plate 3...Case 4...Cam 5...Cam stopper 6...Armature tip 7...Cam guide 8...Movable contact 9
... Fixed contact 10 ... Contact terminal 11 ... Movable lever 12 ... Opening spring 13 ... Switch spring 14 ... Yoke 15 ... End-macha 16
... Iron core lid 17 ... Iron core spring 18 ...
Coil 19...braking oil 2o...movable iron core 21...
・Iron core vibrator 22...Coil terminal 23...Thermostat patent applicant Hiki Electric Co., Ltd. agent Patent attorney Hisato Inoro 1 figure 2 figure

Claims (1)

[Claims] In a circuit breaker that operates using electromagnetic force, a thermostat is connected in series to the series circuit of the coil and contacts, and the circuit is configured to break not only when there is an overcurrent but also when the ambient temperature exceeds a certain reference value. Features a built-in thermostat circuit breaker.